对高炉无料钟炉顶精确布料的改进

 为了解决首秦高炉炉顶布料圈数波动大的问题，对现场多种因素进行调查分析，确定了造成该现象的根本原因是角机反馈角度与节流阀实际开度无法准确对应。根据原有角度反馈控制模式建立了对应的数学模型，并且创新性地提出节流阀的开度由角机角度控制更改为油缸直线位移控制；采用将磁滞位移传感器置于油缸内部的方法，该传感器线性误差在量程300 mm以内可以小于150 μm，而且不受外界环境干扰。改进后，首秦高炉在实际生产中布料圈数稳定性显著提高，实际布料圈数与工长要求布料圈数误差在±0.5圈以内，满足了高炉对装料、布料制度的要求。

Improvement on burden distribution of bell-less top in blast furnace

A lot of complex factors were analyzed in the iron making productive on-site in order to deal with the fluctua-tion of burden distribution laps of bell-less top in blast furnace. The key reason of fluctuation that the feedback angle of selsyn could not correspond to the rotating angle of throttle valve accurately was confirmed in the current study. The mathematic model was built based on the control mode by means of the feedback angle of selsyn. The rotating angle of throttle valve was controlled by the feedback of selsyn instead of the linear displacement of hydro-cylinder. Magnetostric-tive displacement transducer was assembled in the hydro-cylinder so as to keep the signal away from outside interfer-ence. The linearity error was less than 150μm when the displacement range of Magnetostrictive displacement transducer was 300 mm. The stability of the burden distribution was improved significantly and the error range of laps between bur-den distribution and foreman requirement is less than ±0.5 after using the new controlled mode.